Pesticidal mixtures comprising, as active components 1) a compound of the formula I wherein W is CI or CF.sub.3; X and Y are each independently CI or Br; R.sup.1 is alkyl, alkenyl, alkynyl, or cycloalkyl optionally substituted with 1 to 3 halogens, or alkyl which is substituted by alkoxy; R.sup.2 and R.sup.3 are alkyl or may be taken together to form cycloalkyl optionally substituted by 1 to 3 halogens; R.sup.4 is H or C.sub.1-C.sub.8-alkyl, or the enantiomers or salts thereof, and a Compound II selected from organo(thio)phosphates, carbamates, pyrethroids, growth regulators, nicotinic receptor agonists/antagonists Compounds, GABA antagonist compounds, macrocyclic lactone insecticides, METI I acaricides, METI II and III compounds, uncoupler compounds, oxidative phosphorylation inhibitor compounds, moulting disrupter compounds, mixed function oxidase inhibitor compounds, sodium channel blocker compounds, and other various pesticide compounds. In synergistically effective amounts, methods for the control of insects or acarids by contacting them or their food supply, habitat, breeding grounds or their locus with mixtures of the compound I with a compound II, a method of protecting plants from attack or infestation by insects or acarids employing mixtures of the compound I with a compound II, and a process for the preparation of a composition for treating, controlling, preventing or protecting a warm-blooded animal or a fish against infestation or infection by insects or acarids which comprises a pesticidally effective amount of a mixture of the compound I with a compound II.